diggler
1 kW
Hi I'm brand new on here. I have a ebike kit coming soon from ebay. It's the cheep $250 rear hub with tire and rack and thumb throttle. This is the link. http://www.ebay.com/itm/281199914680?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
I think I have found the china website where the motor and controller come from. This is the controller I think.
http://conhismotor.com/ProductShow.asp?id=111
On this site it sais the controller has a max 60v and 30a. Which sounds right. Does anybody know for sure if this controller can handle a little more volts? like 61.5 for a short period of time until the cells settle into nominal voltage 54-55.5v. Or if this is even the right controller for this kit? My problem is I plan on building my own lithium Ion battery pack from old laptop batteries (18650's). I planned on it being two 48v 20ah batteries in parallel making 48v and 40ah. This seemed all fine and dandy until I realized that this battery to be 48v would most ideally be 13 cells in series. This is a problem for me cause I'm cheep and I already bought an Imax B6 balance charger. This charger can only balance charge 6 cells in series, with a max charge output of 5A or 22.2V. Well I got a parallel balance charging board coming for the Imax (also with 6s, 4s, and now 5s leads and some dean connectors) and I don't want to have to charge two or three batteries at once (either 6s or 4s) just to turn around and charge a single cell after. Do you get my point? So now I have decided to either make a 12s or a 15s battery? So I can balance charge the whole battery at once. The problem with the 12s battery is that the nominal voltage is only 43.v! Now I'm not trying to be a speed demon, but from what I've read a 48v system will get you 27mph on the flats and about 20 on a hill. I live in Minnesota so it is legal to drive a ebike everywhere a normal bike can go as long as is doesn't go over 20mph with out peddling, and it doesn't have over a 1000w motor. I was just going to limit my speed on the flats. My concern with the 12s battery is that I'll be running around most of the time at 44v I might not be able to go up them hills at 20mph and the lower voltage will be using more of my precious amperage and will make my motor run a little hotter and not to mention the laptop batteries probably will only have a 1-1.5c rating. I don't know I haven't got them yet, but I figured a 40ah battery even at 1c could keep up with the demand on a 48v 20a 1000w system. So should I just make it a 15s battery? The max voltage will be 61.5 (15X4.1), and a nominal voltage of 54! (15x3.6). I'd really be cruisin then! Probably go around 35mph! I'm also not apposed to having that power available, but can the controller handle that much voltage? (I know the motor can). Is it bad for the cells to only charge them up to 4v each time I recharge the batteries? (15x4=60v) If the controller can really handle 60v this may be the best solution. As far as I know you just don't want to over charge or over drain Lithium Ion cells. If it's really bad to never charge over 4v a cell I can always charge to 4.1 and then turn lights on or something to drain a little initial excess voltage.
I think I have found the china website where the motor and controller come from. This is the controller I think.
http://conhismotor.com/ProductShow.asp?id=111
On this site it sais the controller has a max 60v and 30a. Which sounds right. Does anybody know for sure if this controller can handle a little more volts? like 61.5 for a short period of time until the cells settle into nominal voltage 54-55.5v. Or if this is even the right controller for this kit? My problem is I plan on building my own lithium Ion battery pack from old laptop batteries (18650's). I planned on it being two 48v 20ah batteries in parallel making 48v and 40ah. This seemed all fine and dandy until I realized that this battery to be 48v would most ideally be 13 cells in series. This is a problem for me cause I'm cheep and I already bought an Imax B6 balance charger. This charger can only balance charge 6 cells in series, with a max charge output of 5A or 22.2V. Well I got a parallel balance charging board coming for the Imax (also with 6s, 4s, and now 5s leads and some dean connectors) and I don't want to have to charge two or three batteries at once (either 6s or 4s) just to turn around and charge a single cell after. Do you get my point? So now I have decided to either make a 12s or a 15s battery? So I can balance charge the whole battery at once. The problem with the 12s battery is that the nominal voltage is only 43.v! Now I'm not trying to be a speed demon, but from what I've read a 48v system will get you 27mph on the flats and about 20 on a hill. I live in Minnesota so it is legal to drive a ebike everywhere a normal bike can go as long as is doesn't go over 20mph with out peddling, and it doesn't have over a 1000w motor. I was just going to limit my speed on the flats. My concern with the 12s battery is that I'll be running around most of the time at 44v I might not be able to go up them hills at 20mph and the lower voltage will be using more of my precious amperage and will make my motor run a little hotter and not to mention the laptop batteries probably will only have a 1-1.5c rating. I don't know I haven't got them yet, but I figured a 40ah battery even at 1c could keep up with the demand on a 48v 20a 1000w system. So should I just make it a 15s battery? The max voltage will be 61.5 (15X4.1), and a nominal voltage of 54! (15x3.6). I'd really be cruisin then! Probably go around 35mph! I'm also not apposed to having that power available, but can the controller handle that much voltage? (I know the motor can). Is it bad for the cells to only charge them up to 4v each time I recharge the batteries? (15x4=60v) If the controller can really handle 60v this may be the best solution. As far as I know you just don't want to over charge or over drain Lithium Ion cells. If it's really bad to never charge over 4v a cell I can always charge to 4.1 and then turn lights on or something to drain a little initial excess voltage.